There should be a tiny hole somewhere on the bottom of the barrel assembly, near the rear. Find the right sized hex key and stick it in there. Be VERY gentle, it's quite easy to strip the threads by going too far down, or mess up the precious hop bits by going too far up. I don't know about the Berettas, but on the WA SVIs, I've heard there's around two full turns between no hop and max hop. I can't confirm this though, because I've never had a WA with working hopup =[
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